2012
DOI: 10.1590/s1415-47572012005000010
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Abstract: The cytogenetic characteristics of Pseudoplatystoma corruscans and Pseudoplatystoma reticulatum and their F1, F2 and backcross hybrids were assessed by using chromosome banding techniques. The diploid number of 56 chromosomes was constant in all species and lineages, with a karyotypic formula containing 20 metacentric, 12 submetacentric, 12 subtelocentric and 12 acrocentric chromosomes. Nucleolar organizer regions (NORs) were identified in two subtelocentric chromosomes in the parents and hybrids, with partial… Show more

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Cited by 17 publications
(15 citation statements)
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References 35 publications
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“…In the present study, the use of four nuclear markers (RAG2, GLOB, EF1α, 18S) and one mitochondrial (16S rRNA) marker, enabled the genetic differentiation between P. corruscans, P. reticulatum, as well as, the identification of F 1 and Post-F 1 hybrids, corroborating the results obtained by Hashimoto et al (2012b). Prado et al (2012b), accomplishing cytogenetic analysis, observed that F 1 and Post-F 1 hybrids between Pseudoplatystoma corruscans vs. Pseudoplatystoma reticulatum from the upper Paraná River basin are fertile, since P. corruscans, P. reticulatum, F 1 and Post-F 1 Hybrids revealed a cytogenetic pattern with 56 chromosomes uniformly distributed. This homology in the chromosome constitution of the parental species often results in correct pairing and segregation of chromosomes during meiosis, producing viable gametes in interspecific hybrids.…”
Section: Resultssupporting
confidence: 88%
See 1 more Smart Citation
“…In the present study, the use of four nuclear markers (RAG2, GLOB, EF1α, 18S) and one mitochondrial (16S rRNA) marker, enabled the genetic differentiation between P. corruscans, P. reticulatum, as well as, the identification of F 1 and Post-F 1 hybrids, corroborating the results obtained by Hashimoto et al (2012b). Prado et al (2012b), accomplishing cytogenetic analysis, observed that F 1 and Post-F 1 hybrids between Pseudoplatystoma corruscans vs. Pseudoplatystoma reticulatum from the upper Paraná River basin are fertile, since P. corruscans, P. reticulatum, F 1 and Post-F 1 Hybrids revealed a cytogenetic pattern with 56 chromosomes uniformly distributed. This homology in the chromosome constitution of the parental species often results in correct pairing and segregation of chromosomes during meiosis, producing viable gametes in interspecific hybrids.…”
Section: Resultssupporting
confidence: 88%
“…As F 1 hybrids interbreed with other F 1 hybrids or backcross with their parents, the subsequent generations (Post-F 1 ) will start present genetic similarity with the F 1 hybrids or with the wild parents and may well be mistaken even in genotypic analyzes. Therefore, the et al (2008), Prado et al (2012b), and Hashimoto et al ( , 2012b. Thus, prior to performing any study of genetic variability, a previous genetic identification of these individuals is essential so as to distinguish among hybrid and pure bred organisms and not run the risk of utilizing them as pure species.…”
Section: Discussionmentioning
confidence: 99%
“…Fish farmers cultivating mislabeled hybrids may perform the improper management for these animals, without the required environmental precautions, resulting in fish hybrids escapes into rivers. The main negative impacts of such unintentional introductions arise because hybrids cachapinta are fertile, allowing the occurrence of backcrosses with their wild pure parental species (Prado et al, 2012a(Prado et al, , 2012b. In long term, backcross can cause genetic introgression and contamination of wild pure stocks, and may even lead to local extinction of populations, as observed in several other species (Allendorf et al, 2001;Epifanio & Philipp, 2001).…”
Section: Discussionmentioning
confidence: 99%
“…Furthermore, hybrids can be used as broodstock resulting in high mortality rates or lost of the hybrid vigor in the offspring (Mia et al, 2005;Hashimoto et al, 2013). In the environment, if released or escape to the rivers, hybrids can backcross with the native pure species, causing genetic introgression and contaminating the genetic pool of pure stocks (Prado et al, 2012a(Prado et al, , 2012bVaini et al, 2014).…”
Section: Introductionmentioning
confidence: 99%
“…These species belong to the family Pimelodidae, an important group of Neotropical Siluriformes with an ample Neotropical distribution, and occur in the Amazon River basin (P. reticulatum), San Francisco River basin (P. corruscans) and Prata River basin (P. corruscans and P. reticulatum). The "cachapinta" (Pseudoplatystoma corruscans X P. reticulatum) is fertile and able to cross and produce post-F1 hybrids (F2 hybrids and backcrosses) in lineage cultivation (PRADO et al, 2012).…”
Section: Introductionmentioning
confidence: 99%